Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - wideband O2 sensor, spoofing stock o2 signal for leaner burn

estomax · 06-12-2015, 06:49 PM

thanks for the input guys, mazda6john how lean do you run the hondas?

so far i've driven it for a bit and any higher engine loads the ECU switches to open loop which is really rich, so i am not too worried about that end. Just was wondering about any effects of cruising at a lean mixture. The engine has a temp sensor on the head and that feeds the ECU, so if it gets too hot it starts dumping fuel and goes to closed loop also i'm sure.

i'm currently making a digital AFR gauge out of a Arduino and 7 segment LED display that i can tuck somewhere and maybe use the arduino for other things also (currently taking 0-5V wideband controller signal and putting out a 4 character LED string to a TM1637 module). cheap AFR gauge for ~30$! plug and play, no soldering or any shenanigans.

cheers
Marko

edit: just ran a datalog run, everything seems ok, AFR in boost is 11-12 at high boost and 12-13 during transition/few psi, not as pig rich as i thought it would be. Wierdly though, my ecu dumps fuel under vacuum decel (in gear). at idle itll be nice around 15.5-16 and then if i go down a hill in gear it will drop to low 12s.. i really want a standalone now

06-12-2015, 06:49 PM	#5 (permalink)
estomax EcoModding Lurker Join Date: Sep 2010 Location: Seattle Posts: 11 Thanks: 0 Thanked 5 Times in 2 Posts	thanks for the input guys, mazda6john how lean do you run the hondas? so far i've driven it for a bit and any higher engine loads the ECU switches to open loop which is really rich, so i am not too worried about that end. Just was wondering about any effects of cruising at a lean mixture. The engine has a temp sensor on the head and that feeds the ECU, so if it gets too hot it starts dumping fuel and goes to closed loop also i'm sure. i'm currently making a digital AFR gauge out of a Arduino and 7 segment LED display that i can tuck somewhere and maybe use the arduino for other things also (currently taking 0-5V wideband controller signal and putting out a 4 character LED string to a TM1637 module). cheap AFR gauge for ~30$! plug and play, no soldering or any shenanigans. cheers Marko edit: just ran a datalog run, everything seems ok, AFR in boost is 11-12 at high boost and 12-13 during transition/few psi, not as pig rich as i thought it would be. Wierdly though, my ecu dumps fuel under vacuum decel (in gear). at idle itll be nice around 15.5-16 and then if i go down a hill in gear it will drop to low 12s.. i really want a standalone now Last edited by estomax; 06-13-2015 at 12:49 AM..